a)
[tex]\frac{2}{5}*50=2*10=20[/tex]
b)
[tex]\frac{3}{4}*28=3*7=21[/tex]
c)
[tex]\frac{5}{9}*36=5*4=20[/tex]
d)
[tex]1\frac{1}{7}*21=\frac{8}{7}*21=8*3=24[/tex]
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a)
[tex]\frac{2}{5}*50=2*10=20[/tex]
b)
[tex]\frac{3}{4}*28=3*7=21[/tex]
c)
[tex]\frac{5}{9}*36=5*4=20[/tex]
d)
[tex]1\frac{1}{7}*21=\frac{8}{7}*21=8*3=24[/tex]